It's important to clarify that under copyright law. These dubs are not licensed, and creators cannot monetize them. Many get removed due to copyright strikes. If you want to legally enjoy The Hangover in Tamil, look for an officially dubbed version (if available) or watch with Tamil subtitles on streaming platforms.
Before the era of massive streaming platforms, these fan-dubbed clips were shared via Bluetooth, burned onto CDs, or uploaded to early YouTube channels. They became a rite of passage for college students. The Hangover Tamil Fan Dubbed